May I ask what about ModMii confuses you? You're welcome to use whatever guide you wish, but it would probably be easiest to just help u learn how to use ModMii.

FYI, your cIOS249 is @ rev17, meaning it cannot load games off of a FAT32 or NTFS hard drive, it only works off of a wbfs formatted hard drive. I highly recommend u update your cIOS249 to rev 20 base 56 so that u have the best compatability (warning: rev 18+ breaks triiforce support). If you leave your cIOS249 as is, u can still use your cIOS222/223 to load games off of a FAT32 hard drive.